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Comment highlights statistical issues in examining maternal BMI and preterm birth risk across demographics.
We read with great interest the study by Sawadogo et al examining the relationship between prepregnancy body mass index (BMI), gestational weight gain, and preterm birth (PTB) across racial and ethnic groups.[1] The authors should be commended for utilizing an extensive U.S. natality dataset and for implementing stratified analyses by both weight gain and demographic subgroups, thus enriching the interpretability of BMI-related risk patterns. However, several statistical and clinical concerns merit clarification.
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Satapathy et al. (2025) studied this question.
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